---
kind: "section"
citation: "14 C.F.R. § 21.175"
title: "14"
number: "21.175"
heading: "Airworthiness certificates: classification."
url: "https://uscodex.org/cfr/14/21.175"
---

# §21.175. Airworthiness certificates: classification.

- (a) Standard airworthiness certificates are airworthiness certificates issued for aircraft type certificated:
  - (1) In the normal, utility, acrobatic, commuter, or transport category;
  - (2) As manned free balloons; or
  - (3) **As special classes of aircraft.**
- (b) **Special airworthiness certificates are airworthiness certificates issued for—**
  - (1) Aircraft type-certificated in the primary, restricted, provisional, or limited category;
  - (2) Aircraft certificated in the light-sport category;
  - (3) Aircraft operating for an experimental purpose; or
  - (4) **Aircraft operating under a special flight permit.**

## Notes

### Amendments

[Docket No. FAA-2023-1377, Amdt. 21-109, 90 FR 35205, July 24, 2025]

### Source

Source: Docket No. 5085, 29 FR 14569, Oct. 24, 1964, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7572; 49 U.S.C. 106(f), 40105, 40113, 44701-44702, 44704, 44707, 44709, 44711, 44713, 44715, 45303.

### Amendments

[Docket No. FAA-2023-1377, Amdt. 21-109, 90 FR 35205, July 24, 2025]